单项选择题

According to Paragraph 1, compared with today, industries in the past______.

A．were controlled less strictly
B．were worse off
C．affected more people's health
D．put out more unhealthy products
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单项选择题
The main topic of the passage is ______.
A．industries in the past and at present
B．changes in the development of industries
C．the protection of industrial workers and customers
D．the freedom of industries
单项选择题
It is implied in Paragraph 2 that years ago governments______.
A．paid much attention to the results of scientific discoveries
B．seldom introduced safety laws before disasters occurred
C．hardly ever looked into the causes of tragedies
D．imposed safety rules as soon as disasters occurred
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